String handling: refactor the expanding-string routines and users to use a descriptor...

[exim.git] / src / src / structs.h

diff --git a/src/src/structs.h b/src/src/structs.h
index c16899a0c7a3ace69082250938c8afb5183f363f..22c141c0d634e244910111e81771e6d39b6b6b12 100644 (file)
--- a/src/src/structs.h
+++ b/src/src/structs.h
@@ -25,6 +25,13 @@ struct smtp_outblock;
 struct transport_info;
 struct router_info;
 
+/* Growable-string */
+typedef struct gstring {
+  int  size;           /* Current capacity of string memory */
+  int  ptr;            /* Offset at which to append further chars */
+  uschar * s;          /* The string memory */
+} gstring;
+
 /* Structure for remembering macros for the configuration file */
 
 typedef struct macro_item {
@@ -238,7 +245,7 @@ typedef int (*tpt_chunk_cmd_cb)(struct transport_context *, unsigned, unsigned);
 typedef struct transport_context {
   union {                      /* discriminated by option topt_output_string */
     int                          fd;   /* file descriptor to write message to */
-    uschar *             msg;  /* allocated string with written message */
+    gstring *            msg;  /* allocated string with written message */
   } u;
   transport_instance   * tblock;               /* transport */
   struct address_item  * addr;
@@ -249,10 +256,6 @@ typedef struct transport_context {
   /* items below only used with option topt_use_bdat */
   tpt_chunk_cmd_cb       chunk_cb;             /* per-datachunk callback */
   void                 * smtp_context;
-
-  /* items below only used with option topt_output_string */
-  int                    msg_size;
-  int                    msg_ptr;
 } transport_ctx;